The USPS Quick Service Guide is an invaluable tool in keeping up with postal regulations. On the down side, it’s pretty hefty. Below are specific pages that you might find useful as an overall description of mailing services and specifications.
TEMPLATES
Formatting your files, postal permit (indicia) formats, design templatesLetter-Size Mail Dimensional Standards Template (Notice 3A)
Letter-Size Mail Dimensional Standards Template (Notice 67)
First-Class Mail Shape-Based Pricing Template
Oversized Postcard Template
Standard Postcard Template
